6447557356161 has 4 divisors (see below), whose sum is σ = 8596743141552. Its totient is φ = 4298371570772.

The previous prime is 6447557356153. The next prime is 6447557356181. The reversal of 6447557356161 is 1616537557446.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6447557356161 - 2³ = 6447557356153 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6447557356095 and 6447557356104.

It is not an unprimeable number, because it can be changed into a prime (6447557356181) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1074592892691 + ... + 1074592892696.

It is an arithmetic number, because the mean of its divisors is an integer number (2149185785388).

Almost surely, 2^{6447557356161} is an apocalyptic number.

It is an amenable number.

6447557356161 is a deficient number, since it is larger than the sum of its proper divisors (2149185785391).

6447557356161 is a wasteful number, since it uses less digits than its factorization.

6447557356161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2149185785390.

The product of its digits is 63504000, while the sum is 60.

The spelling of 6447557356161 in words is "six trillion, four hundred forty-seven billion, five hundred fifty-seven million, three hundred fifty-six thousand, one hundred sixty-one".